Valve Seat Inserts

Alloys "Q" Series:Our high-chrome alloy designed for unleaded fuels which enables Rockwell Rc40 hardness combined with easy machinability. Features excellent resistance to high temperature corrosion in applications to 1150°F. All 20- and 21- prefixes without a suffix are cast in Q material.

"S" Series:Our stellite series. A cobalt-based alloy used in a very limited range of specialized applications where additional abrasion resistance is necessary. Rockwell Rc53. Denoted by the suffix "S".

Engineered Advantages:Q, N, and S series inserts are individually cast and have a true radius on the lead-in edge to facilitate the press fit. Also, all seats have a fully finished inside diameter to assist gas flow and swirl.

Sizes "20-" Prefix: The 4-digit part number is the cutter size. 1562 = 1.562" or 1-9/16" cutter. Actual O.D. of the seat is increased by the press fit for cast iron heads - between 0.0045 and 0.006 inches.

"21-" Prefix: The 4-digit part number is the cutter size as above. Actual O.D. of the seat is increased by the press fit for aluminum heads - 0.007 inches.

"22-" Prefix: The 4-digit part number is the actual O.D. 2006 = 2.006 inches.